condition mean min max ZT0-3 2.0 2.0 2.0 ZT4-7 2.1 2.1 2.1 ZT8-11 4.699999999999999 4.699999999999999 4.699999999999999 ZT12-15 17.35 17.35 17.35 ZT16-19 6.4 6.4 6.4 ZT20-23 3.5500000000000003 3.5500000000000003 3.5500000000000003